CAJ | 학술논문

在Gleeble-1500热模拟试验机上对Ti-Mo-V微合金化钢进行单道次热模拟压缩试验，分析了变形温度、应变速率、变形程度等对试验钢热变形行为的影响。结果表明，在一定条件下，流变应力随变形温度的升高而降低，随应变速率的增加而增大。当应变速率大于10 s-1和变形温度小于1000℃时，发生动态回复；当应变速率小于1 s-1和变形温度大于850℃时，发生动态再结晶。在Sellars-Tegart方程的基础上，建立了试验钢加工硬化-动态回复和动态再结晶精度较高流变应力模型，并采用回归的流变应力模型预报了Ti-Mo-V微合金化钢的实际轧制压力，预报值与实测值吻合良好。
재Gleeble-1500열모의시험궤상대Ti-Mo-V미합금화강진행단도차열모의압축시험，분석료변형온도、응변속솔、변형정도등대시험강열변형행위적영향。결과표명，재일정조건하，류변응력수변형온도적승고이강저，수응변속솔적증가이증대。당응변속솔대우10 s-1화변형온도소우1000℃시，발생동태회복；당응변속솔소우1 s-1화변형온도대우850℃시，발생동태재결정。재Sellars-Tegart방정적기출상，건립료시험강가공경화-동태회복화동태재결정정도교고류변응력모형，병채용회귀적류변응력모형예보료Ti-Mo-V미합금화강적실제알제압력，예보치여실측치문합량호。
Single pass compression tests for a Ti-Mo-V micro-alloyed steel were conducted on Gleeble-1500 thermal-simulation machine. The effects of deformation temperature, strain rate and strain on hot deformation behavior of the tested steel were analyzed by using compression tests. The results show that under certain conditions, flow stress decreases with increase of deformation temperature and increases with increase of strain rate;dynamical recovery of the experimental steel occurs with strain rate more than 10 s-1 , deformation temperature less than 1000 ℃;dynamical recrystallization occurs with strain rate less than 1 s-1 , deformation temperature more than 850 ℃. The flow stress high precision models at work hardening and dynamical recovery stage and dynamical recrystallization stage were established respectively based on the Sellars-Tegart equation. Forecasting the industrial rolling pressure of Ti-Mo-V micro-alloyed steel by using the regression flow stress model, the forecast values are in good agreement with the measured values.